Performance Comparison of H-Type Darrieus Vertical Axis Wind Turbine for Varying Tip Speed Ratios

Earlier studies focused on performance improvement of various types of VAWTs but a limited number of research has been done for H-type Darrieus vertical axis wind turbine (VAWT). For this VAWT, the effect of different types of aerofoil at different TSRs has not yet been studied thoroughly. To focus on these gaps, the present study performs a CFD simulation of performance in terms of coefficient of power for an H-type Darrieus VAWT for varying tip speed ratios. For this purpose, Computational Fluid Dynamics (CFD) is performed for two configurations having aerofoils NACA0015 and EPPLER479. The purpose is to obtain the maximum torque and power coefficient to get the desired result. Performance is compared in terms of power coefficients (CP) for different input variables, including the tip speed ratio (TSR) and set of aerofoils. The study range of tip speed ratio is from 1.5 to 4.5 for both aerofoils. Results showed that at lower tip speed ratios (<= 2.5), the performance of NACA0015 is better than EPPLER479 and at higher tip speed ratios (>3.0) the performance of EPPLER479 is better.